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Generalized Equivalent Circuit Model of MMC-HVDC for Power System Simulation

a power system and equivalent circuit technology, applied in the field of mmcs, can solve the problems of time-consuming and infeasible modeling and simulation of large-scale mmcs-embedded power systems with detailed switching models, time-consuming and infeasible dsm modeling, etc., to improve simulation efficiency, efficiently and accurately model and simulate, the effect of improving simulation efficiency

Active Publication Date: 2020-06-25
SHI DI +7
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a method for modeling and simulating various multi-arm converter systems based on different operating conditions. This method uses a generalized equivalent circuit model (ECM) that takes into account the dynamic behavior of different components of the system. This approach helps to improve the accuracy and efficiency of the simulation process and also allows investigation of internal control strategies, such as capacitor voltage balancing. The reduced-order ECM, which simplifies the averaging of capacitor voltage dynamics, further enhances the efficiency of the simulation.

Problems solved by technology

The efficient model of MMC is one of the main challenges associated with the study of large-scale MMC-based power systems.
However, it is time consuming and infeasible to model and simulate large-scale MMCs-embedded power systems with detailed switching model (DSM).
However, detailed DSM modeling is time-consuming and infeasible due to a large number of semiconductor switches in high-level systems.

Method used

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  • Generalized Equivalent Circuit Model of MMC-HVDC for Power System Simulation
  • Generalized Equivalent Circuit Model of MMC-HVDC for Power System Simulation
  • Generalized Equivalent Circuit Model of MMC-HVDC for Power System Simulation

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Embodiment Construction

I. Configurations and Operational Principles of the ECM

[0027]A. Operational Principles of the MMCs Based on Various SM Configurations

[0028]A system is disclosed with an equivalent circuit model to model and to simulate MMC-based HVDC systems and dc grids in a large-scale hybrid ac and dc power system, and the system can consider various SM circuits and arm configurations under different operating conditions.

[0029]A schematic diagram of the MMC and various SM circuits are shown in FIG. 1. The operating states of the HB SM include inserted, bypassed, and blocked. The various fault-blocking SMs consist of parallel-connected or series-connected HB SMs.

[0030]The operating conditions of MMCs mainly include the precharging / startup process, the normal operating condition, and the fault condition. Under dc fault condition, the MMC based on HB-SM (HB-MMC) cannot block the fault current feeding from ac grid. Under dc fault condition, the capacitors in fault-blocking SMs can support the line-li...

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Abstract

A method to simulate a circuit includes receiving at least one circuit requirement and at least one Modular Multilevel Converter (MMC) parameter; determining an operating mode and switching states of an arm circuit; determining each capacitor current based on the switching states and an arm current; determining capacitor voltage and arm voltage; and generating an equivalent circuit model to simulate MMC-based HVDC systems and DC grids in a hybrid AC and DC power system.

Description

TECHNICAL FIELD[0001]This invention relates to an efficient model of Modular Multilevel Converters (MMCs), which is based on the generalized equivalent circuit for high-voltage direct current (HVDC) systems.BACKGROUND[0002]MMCs have become the basic building block for multi-terminal dc (MTDC) systems and dc grids. Due to modularity and scalability, the MMC becomes the most attractive converter topology for medium / high voltage applications, especially for voltage-sourced converter high-voltage direct current (VSC-HVDC) transmission systems. Large-scale MMCs-embedded power systems need to investigate dynamic performance, fault, protection, and stability. The efficient model of MMC is one of the main challenges associated with the study of large-scale MMC-based power systems.[0003]To analyze large-scale hybrid ac and dc power systems, modeling and simulation plays an important role in investigating system dynamics under various operating conditions, i.e., startup, normal, transient, an...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F17/50H02J3/36H02M7/483
CPCH02J3/36H02M7/483G06F30/367H02M1/36H02J2203/20H02M1/325H02M7/4835H02M1/0095H02M7/4837
Inventor SHI, DIZHAO, XIAOYINGXUE, FENGLI, WEIPENG, HUIMINQIN, JIANGCHAOJING, CHAOYANGWANG, ZHIWEI
Owner SHI DI
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